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Liquid crystal display device and polarizing plate

a technology of liquid crystal display and polarizing plate, which is applied in the direction of polarizing elements, instruments, optics, etc., can solve the problems of poor viewing angle characteristics of backlights (bl), extreme increase of luminance in specific oblique directions, and light leakage, etc., to achieve the effect of improving contrast ratio

Active Publication Date: 2021-12-02
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a liquid crystal display screen and a polarizing plate that can improve the clarity of images in front of the screen.

Problems solved by technology

Additionally, a prism sheet used for increasing the luminance of a backlight (BL) also has poor viewing angle characteristics (e.g., see paragraphs [0027-0037] and FIGS. 2 and 3 in JP 2008-3232 A) and tends to extremely increase the luminance in specific oblique directions (this phenomenon is expressed as that a luminance profile has side lobes).
This tendency combines with poor viewing angle characteristics of the polarizing plate to cause light leakage.

Method used

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  • Liquid crystal display device and polarizing plate
  • Liquid crystal display device and polarizing plate
  • Liquid crystal display device and polarizing plate

Examples

Experimental program
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Effect test

embodiment 1

[0184]FIG. 1 is a schematic cross-sectional view showing a structure example of a liquid crystal display device and a polarizing plate of Embodiment 1. A liquid crystal display device 1 of the present embodiment is a transmissive liquid crystal display device that includes a stack sequentially including from the viewing surface side toward the back surface side a first polarizer 11, a liquid crystal panel 20 including a liquid crystal layer, a second polarizer 12, a first retarder 31a, a third polarizer 13, and a backlight (BL) 40 as shown in FIG. 1. A polarizing plate 51 of the present embodiment includes a stack sequentially including the second polarizer 12, the first retarder 31a, and the third polarizer 13. In other words, the polarizing plate 51 includes a pair of polarizers 12 and 13 and the first retarder 31a between the paired polarizers 12 and 13.

[0185]FIG. 2 is a schematic cross-sectional view showing another structure example of the liquid crystal display device and the ...

embodiment 2

[0244]The present embodiment is substantially the same as Embodiment 1 except for the axis azimuth of the third polarizer, the structure of the retarder(s), and the arrangement direction of the first and second prism sheets. The repetitive description is thus appropriately omitted. In the present embodiment and Embodiment 1, the same members or the members having similar functions are given the same reference sign, and description for the member is omitted in the present embodiment as appropriate.

[0245]FIG. 8 is a schematic cross-sectional view showing a structure example of a liquid crystal display device and a polarizing plate of Embodiment 2. A liquid crystal display device 2 of the present embodiment is a transmissive liquid crystal display device and includes a stack sequentially including from the viewing surface side toward the back surface side the first polarizer 11, the liquid crystal panel 20 including a liquid crystal layer, the second polarizer 12, a first retarder 51b,...

embodiment 3

[0273]The present embodiment is substantially the same as Embodiment 1 except that a viewing angle compensation film is further disposed in at least one of a region between the first polarizer and the liquid crystal panel or a region between the liquid crystal panel and the second polarizer. The repetitive description is thus appropriately omitted. In the present embodiment and Embodiment 1, the same members or the members having similar functions are given the same reference sign, and description for the member is omitted in the present embodiment as appropriate.

[0274]FIG. 35 is a schematic cross-sectional view showing a structure example of a liquid crystal display device and a polarizing plate of Embodiment 3. A liquid crystal display device 3 of the present embodiment is a transmissive liquid crystal display device that includes a stack sequentially including from the viewing surface side toward the back surface side the first polarizer 11, the liquid crystal panel 20 including ...

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Abstract

Provided is a liquid crystal display device and a polarizing plate capable of improving the contrast ratio in the front direction. The polarizing plate includes a pair of polarizers including a first polarizer and a second polarizer whose transmission axes are parallel to each other; a retarder between the paired polarizers; and a diffusion layer in at least one of a region between the paired polarizers or a region on a side without the retarder of the first polarizer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2020-095061 filed on May 29, 2020 and Japanese Patent Application No. 2020-154960 filed on Sep. 15, 2020, the contents of which are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to liquid crystal display devices and polarizing plates.Description of Related Art[0003]A typical liquid crystal display device typically consists of members such as a liquid crystal panel, a backlight, and optical elements including a polarizing plate and a retarder. Liquid crystal display devices have excellent display properties and are thus widely used for electronic devices such as monitors, projectors, mobile phones, and personal digital assistants (PDAs).[0004]Also, a technique has been known in which use of a polarizing plate and a retarder can control the viewing angle ch...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02F1/1335G02F1/13363G02B5/30
CPCG02F1/133531G02B5/3083G02F1/13363G02F1/133528G02F1/133615G02F1/133538G02F1/133504G02F1/133524G02F1/133631G02B5/045G02B5/3041G02B5/0278G02B27/286
Inventor SAKAI, AKIRAKAWAHIRA, YUICHIHASEGAWA, MASAHIROMINOURA, KIYOSHI
Owner SHARP KK